Fuck her ass assertively.

You offer neither of them any greeting or explanation. Moving to stand behind the woman, you place a hand on her back, between her shoulder blades, and push her insistently to bend forward further, over the cantaloupes. Automatically, she catches herself with her hands, supporting herself against the edge of the display. You hear her let out a little gasp of surprise, but she makes no move to resist you or get out of this position. Her husband does nothing to intervene either, although his eyebrows rise a little further. "Uh, can we help you?" he asks, audibly a little taken aback.

"Oh, don't mind me," you say to him as casually as you can, amused at the idea of speaking to him while not addressing his wife at all. While holding her in place with your hand on her back, you somewhat awkwardly undo your belt and jeans with your free hand, pulling down the waistband of your underwear to let your cock spring free. "I'm just gonna fuck your wife's ass for a while."

His expression softens as understanding dawns. "Oh, I see! Fair enough."

Reaching into your pocket for the small bottle of water-based lube you carry with you at all times for situations just like this, you quickly apply a couple of squirts to your dick, making sure it's good and slippery. As you turn your focus back to the woman, you find her craning her neck to look back at you, nodding encouragingly. "Yeah, actually, that's great timing," she says, a little breathlessly, as you probe between those pillowy asscheeks of hers with your fingers, searching for the string of her thong. "I've been really in the mood for some anal today."

Her husband gives a mock-affronted smile. "Why didn't you say so?"

Finding what you're looking for, you hook your fingers around the little strip of fabric and pull it out of the way. Figuring she gets the message about staying bent over, you take your hand off her back to grab her buttcheek and spread it, half-revealing her plush pink pussy lips and an asshole that, from its slightly puffy look, you guess she's had plenty of practice using. "Well, we were a little busyyy this morning," she gasps as you abruptly penetrate her, pushing in slowly but forcefully. You can feel her body responding right away, her hole stretching to accommodate you with hardly any trouble.

You chuckle as you begin to fuck her, taking it a little slow now that you're comfy inside her. "Damn...your ass feels like it was made for this."

She lets out a happy sound somewhere between a sigh and a gasp. "Thank you...I'm pretty proud of it." Her voice is still a little breathless, and her exhales come out with small sounds—pleasure, exertion, maybe both. She turns her head back to her husband. "You can...go on with the shopping if you want. I guess I'll...be a few minutes."

He shakes his head, a smile touching his lips. "It's fine. I can wait."

Nice to know you're not holding them up. Now comes the fun part.